Vibrating device for denture material



Dec. 27, 1955 BAILEY 2,728,562

VIBRATING DEVICE FOR DENTURE MATERIAL Filed Oct. 22, 1952 2 Sheets-Sheet l INVENTOR LAZARD L. BAILEY BY HM R.

ATTORNEYS Dec. 27, 1955 BAILEY 2,728,562

VIBRATING DEVICE FOR DENTURE MATERIAL Filed Oct. 22, 1952 2 Sheets-Sheet 2 INVENTOR LAZARD L. BAILEY ATTORNEY.

-- motor housing.

ably opposite the bottom opening'29, is cut away'as indi- 2,728,562 VIBRATING DEVICE FOR ,DENTURE MATERIAL Lazard'L. Bailey, New-firleans, La. Application October-22,1952, Serial No. 316,214 '4 Claims. r (Cl.t259-@72) The present invention relates to improvements in vibrating device for denture material and relatesmore particularly to the type embodying the vibratory principlelfor settling the investmentorother material and removing theentrapped air therefrom.

An object of the present invention is: to provide adevice of the character described which'is ineigpen'sive in manufacture, has structural simplicity, ,audjishighly portable taking up a minimum of laboratory',space and which lends itself to being quickly set up and used.

Another object of the present invention is to, provide a device having a constant or uniform rate .of vibration as distinguished from intermittent or sporadicjarring whereby the investment or other .material will vbe uniformly agitated and settled with removal -.of substantially .all .entrapped air.

A still further object .ofthe presentinventionis to provide a device whichtwill perform the above work and which is of extremely light weight.

With the foregoing and: other objects in view, .the invention will-be more'fullydescribed hereinaftenand will be more particularly pointed out in the claims appended hereto.

In the drawings, wherein like symbols refer tolike or corresponding parts throughout the several views,

Figure 1 is a perspective view of a device constructed in accordance with the .presentinvention;

Figure 2 is an explodedperspective view taken-on an enlarged scale with parts broken away;

Figure 3 is a side elevationalview taken on a. still further enlarged scale on theline 3-3 of Figure .1; and

Figure 4 is a vertical crosstsectional view takenon the line 4-4 in Figure 3.

Referring moreparticularlyto the drawings, inwhich only one form of the invention is shown, 10 is an electric motor having a housing divided into two shells 11 and 12. The shell 11 has a substantially flat end wall 13 while-the shell 12 has adome-like end 14 having ventilation ports '15 therethrough.

An annular retaining ring .16is secured to the :motor casings or shells 11 and '12 and connects a handle 17 to the motor. The :handle 17 has an axial bore 18 therethrough accommodating an electrical cord 19 for applying power to the motor 10.

The motor liihas an armature shaft extension 20 upon which is secured an eccentric weight 21, semi-circular in shape. This eccentric weight 21 is secured to the armature shaft 20 by set screws 22 and '23.

On rotation, the eccentric weight 21 sets up vibrations and constitutes the vibrator element. Such element is preferably enclosed in a suitable casing, one preferable form of which is shown in the drawings to consist of a part-circular wall 24, open at its lower end as indicated at 29 (Figure 4). Thisenveloping wall 24 is open atits inner edge which is presented against the flat-wall 13 of the An upper segmentof the wall 24, preferates Patent 2,728,562 Ratented Dec. 27, 1955 :2 .catedat '26 leaving edges. 31. at opposite sideslof .theppenings 26 and j29-whichare'in contact with the flatmotor housing wall'I3.

The outerside of the .vibratorcasing24 is. only ,partly vclosedgby upper and lowerouterv walls-25 and 27 which .are a separated by a slot The;lower-.wa1l is preferably bulged outwardly and slotted lasindicated at 33, one ;slot being shownin spaced relation-to the upper free .edgeu34 and at opposite sides .of a part-conic section. 35.having-;-its upper truncatedapex lying substantially flush with the upperredge 34, and with. its. lower wider: basal. edge terminatingat substantially the lower edge of theslower-wall 27. The conic sec'tion is madehy bulging outwardly thetintermediate portion of .theilowerwall27.

.Theupper wall 25 isprovided with a hole 36- and. holes 37 and 38 aremade in.the.lower.wall.27 .at-oppositmsides of. the coniclsection 35,1thns thethree openings 36,137;- and '38 are or may be. in a triangulated arrangementto agree with similarly .threadedholes39and '40-.made intheflat end wallr1'3of the motor housing.

'Suchopeuiugsare adaptedto receive screws .32 orother fasteners by which the vibrator casing may be .secured tightly against the flat wall,. 13. ofthe motorhousing.

,As. shown moreparticularly: in Figure ,3, thescrews'may ,be 'adaptedto pass through sleeves 28 tand.-28 whichare arranged within the vibrator. casing in. registry with :the holes 36, 37 and38. Such sleeves .28 maybe welded ,to .the adjoining walls .ofthe vibrator casing vandprov-ide extensive support .for ;the ,fastenings v32. .The uppermost sleeve. 28" islaxially shorter. thantthertwo lower sleeves '28 to conform to the. cut-.away portion .26. of the --vibrator casing.

The vibrations .are transmitted to anappropriatesupport, which, intheinsta-nce shown, consists of-a plate tl. The plate is.advantageouslyrof plasticwmaterial andiszsecured to the motor housing-in anyappropriatemannerifor instancew atone. point of anchorage by ascrew or a;bolt"42, the ,head vof which may. berset flush in theplate --41,:the screwlbeing threaded. into-the-threaded wall orrsocket= 43 in thetmotorhousing, for-instance intheupper portionv of the shell 12 at a point remote from the vibrator.

Theplate -.41 .extends. outwardly and preferably beyond .thedomel4 of theshell 12 and-.such plate iszsufficiently --wide ..to lie abovealloftheslots :15-to act as a shield'ato prevent investment 1 material or other material from :the vibrating operation from droppingdownintoithe'motor housing through suchslots :15. The outer free edge of the plate -.'is.indicated at-41 rand such edgezis preferably unsupported.

.The oppositeedge of the plate 41 -is preferably-curved or rounded tothe end .that-the-plate is provided with an languflarly disposed end portion 44 which dependsifrom the platein .closeproximity.to-the vibratorycasing. "Such dependent endportion .44 is provided with1a:hole='4'5*to receive thetop screw or fastening 32,-this screw "passing throughthe plate portion 44, through the; upper-outer end wall' 25 of the vibrator casing, through. the [sleeve 28' and thenceinto thethreaded .opening 39 in theflat-rwall 13 of the motor housing. This dowmturned angled end portion 44 of the. support .plate =41 maylie-insubstantially the same plane asthe-lower-wall27. If desired, its lower .free edge may he made toengage the upper edge 34 of the wall 27, although preferably such parts are -':slightly spacedapart. Also the inner surface of the angledend 44 may be forced by the .top ,screw32 against the upper wall'25, although preferably these parts are slightly spaced apartso as'to givercomplete freedom of movement to the angled end 44. lBy..adjusti-ng the distancerbetween the hole 45 and the screw anchorage42,-the angled end .44 may be made .to keepsitsrdistance from any part of the vibrator casing even underthe lightening actionof :the top screw '32. "In this aspect the anchorage screw :42

serves as a stop to limit the movement of the angled end 44 toward the vibrator casing. A single screw 42 is preferably used to secure the support plate 41 to the motor housing and also a single screw 32 to secure the angled end 44 to the flat plate 13 of the motor housing.

The curved portion 41 and the angled end 44 constitute a shield for preventing investment and other material employed in the vibrating operation from finding its way downwardly into the vibrator element.

The motor is provided at a suitable point with a snap or other switch 46 for turning the motor on and 05. This switch 46 is in a trigger-like relationship with respect to the handle 17, as best seen in Figure 1.

In operation the impression is boxed in and a mix of plaster or castone is made. Enough of this mix is then poured into the tray 47 (Figure l) to cover the floor of the impression. The handle 17 of the device is placed in the palm of the hand of the user in such way that the handle 17 lies between the users thumb and index finger in a pistol-like grip with the index finger engaging the snap switch 46. By moving this snap switch in one direction the motor is energized rotating the armature shaft 20 and the entrained eccentric weight 21. Such weight rotation gives rise to high frequency vibrations which are communicated to the plate 41 and to its angled end 44 in a manner presently described.

The tray 47 is held by its handle with the metal part of the tray resting on the plastic plate 41. The vibratory action is permitted to continue for a few seconds until the mixture is evenly spread over the impression and all air bubbles disappear; whereupon the switch 46 is turned ofi. The vibrator may be then laid on a bench or convenient support while more material is added to the impression, after which the vibrator is again lifted and put in operation to subject the attendent material to further vibratory treatment. If, after the second operation, more material is needed, it may be added and patted into position without any further vibration being necessary.

It will be noted that While the eccentric flywheel 21 has been illustrated as semi-circular, any geometric shape may be employed which will result in a non-balanced Wheel. Varying degrees of off-balancing of the flywheel will result in settling the mix quickly or slowly and more evenly as desired.

This light weight portable vibrator requires no table space in the dental laboratory and may be employed to vibrate both large and small impressions. Because of the weight and surface area of the plate 41 and its angled end 44 the device is easy to keep clean.

The vibrations originate in the projected end 20 of the motor armature shaft, the outer end of which is free and unsupported. Due to its proximity to the source of vibration, the fiat end wall 13 of the motor housing will acquire vibrations of similarly high frequency and intensity. Such vibrations are directly communicated through the top screw 32 to the angled end 44 of the support plate. In this way such angled end 44 receives vibrations of a high order of frequency and intensity which are transmitted to the curved end 41 of the plate 41 and to this end of the plate 41.

On the other hand vibrations of a lower order of intensity are communicated to the support plate 41 at the anchorage point 42 due to the fact that this anchorage point is more remote from the source of vibration and because the vibrations tend to become somewhat damped because of passing through the armature shaftand bearings and other parts of the motor. It is found that the vibration intensity of the plate 43 in and about the anchorage point 42 is substantially less than the vibration intensity occurring at the curved portion 41 The arrangement, therefore, provides in a single support plate 41 areas of different vibration intensity Where the tray 47 may be moved selectively in order to shake down and settle the material in the shortest space of time. Also diiferent materials will respond more quickly to different vibration intensities. The curved end 41 of the plate is,

due to this curvature, substantially unsupported. Due to the relative angular relation of the axes of the fastening 42 and top fastening 32, the angled end 44 of the plate is not interfered with in its vibratory movement by the screw 42. Moreover, the high intensity vibrations occurring in the angled end 44 tend to damp out as they approach the anchorage 42.

The openings 26, 29, 30 and 33 provide air circulation in and about the vibrator in the end of the motor. However, these openings and slots give to the vibrator casing a characteristic which enables the same to readily partake of the vibration of the end motor housing wall 13. The various slots and openings leave the walls more or less unsupported so that they can readily vibrate. The vibrations of the walls of the vibrator housing are, of course, communicated to the top screw 32 and to the angled end 44 to augment the vibrations communicated to this down-turned end 44 of the plate.

Although I have disclosed herein the best form of the invention known to me at this time, I reserve the right to all such modifications and changes as may come within the scope of the following claims.

What I claim is: I v

l. in a vibrating device, a motor driven vibrator, a vibratory part vibrated thereby, a support for material to be agitated and having an angled end, said support being mounted on the motor and having a connection be,-

tween the vibratory part and said angled end for transmitting vibrations from said vibratory partto said. support, said connections including a casing enclosing said vibrator, means including a sleeve in the casing contacting both said casing and a portion of said vibratory part.

2. In a vibrating device, a motor having an extension shaft, a vibrator on said shaft, a vibrating casing attached to said motor and surrounding said vibrator, said casing comprising a part-circular wall having an opening and an inner cut-away portion, and an outer side with upper and lower walls spaced apart, said lower wall having slots and an outwardly-bulged portion, and a plate for supporting material to be agitated having a portion in vibratory communication with said casing.

3. In a motor driven vibrating device for settling denture material and removing the entrapped air therefrom, a housing for said motor mounted for vibration having an end wall and a surrounding wall joined to the end wall and provided with a portion remote from the end wall, vibrating means for imparting vibrations to said housing comprising a shaft driven by said motor and a vibrator element on one end only of the shaft and operatively connected to said housing adjacent said end wall, whereby vibrations of a high order of frequency and intensity are imparted to the end wall and vibrations of less frequency and intensity are imparted to the remote portion of the surrounding wall, and a support having a substantially flat elongated portion for supporting the denture material and an angularly disposed end portion, adjacent and operatively connected tosaid end wall so that vibrations of a high order of frequency and intensity are trans mitted to the area of the flat portion of the support adjacent the angularly disposed end'portion, the remote 4. In a motor driven vibrating device for settling den ture material and removing the entrapped air therefrom, a housing for said motor having an end wall and a surrounding wall provided with a portion remote from the end wall, vibrating means for imparting vibrations'to said housing comprising a vibrator element connecteclto said housing adjacent the end wall, whereby vibrations of a high order of frequency and intensity are imparted to the end wall and vibrations of less frequency and intensity are imparted to the remote portion of the surrounding wall, and a support for the denture material having a first part connected to the housing end wall and a second part connected to the remote portion of the housing surrounding wall so that an area of vibration of a high order of frequency and intensity is produced in said support adjacent the first part thereof and an area of vibration of less frequency and intensity is produced in said support adjacent the second part thereof.

References Cited in the file of this patent UNITED STATES PATENTS Wood June 29, Jackson Mar. 18, Clark July 11, Jackson Dec. 27, Mall July 30, Jackson Dec. 22, Wendt Feb. 4, 

